ELEOPTION(TM) Panasonic P-P511 NiMH 1600mAh Phone Battery Rechargeable Battery for Panasonic P-P511 HHR-P402A ER-P511 ER-P507 N4HKGMA0001 Type Phone Battery 100% OEM Compatible - Complies with or Exceeds OEM Panasonic P-P511 Battery specs Guaranteed to operate with your Panasonic P-P511 cordless phone Stay connected with families and friends by getting extra battery power today. Best replacement for the original battery with comparable standby and talk time. Great bargain with excellent quality guaranteed. Color: Black. Voltage: 3.6V.